It's great to hear of others trolling experiences. I troll from my Hobie 14 and 16 here in Okinawa, Japan. Mostly catching wahoo, tuna, mahi and spanish mackerel in season. I wrote about it in another thread here
https://www.hobie.com/forums/viewtopic.php?f=9&t=65600Though I'm on the 14 and 16 and you are on the Tandem Island I'm sure there a lot of similarites. I tend to have most sucess around 6-8 knots usually trolling plastic skirts on pusher type heads. I run two rods and either have 2 skirted lures or one and a hard lure like a Yozuri Bonita or Rapala magnum deep diving minnow type. In mahi season I will carry a lighter weight spinning rod and cast lures at any busting schools I come across but for the most part I'm just puttin the trollimg lures out the back as I sail around the bay.
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Hobie Wave 2004
Hobie 14 1991 Plum 40525
Hobie 16 1985 Nationals White Prism 91964
Hobie 16 1985 European Championships Palma 114072